/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.execution.support;

import io.crate.exceptions.Exceptions;
import io.crate.exceptions.SQLExceptions;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportResponse;

import java.io.IOException;

public final class NodeActionRequestHandler<TRequest extends TransportRequest, TResponse extends TransportResponse>
    implements TransportRequestHandler<TRequest> {

    private final NodeAction<TRequest, TResponse> nodeAction;
    private static final Logger LOGGER = LogManager.getLogger(NodeActionRequestHandler.class);

    public NodeActionRequestHandler(NodeAction<TRequest, TResponse> nodeAction) {
        this.nodeAction = nodeAction;
    }

    @Override
    public void messageReceived(TRequest request, TransportChannel channel, Task task) throws Exception {
        try {
            nodeAction.nodeOperation(request).whenComplete((result, throwable) -> {
                if (throwable == null) {
                    try {
                        channel.sendResponse(result);
                    } catch (IOException e) {
                        LOGGER.error("Error sending response: " + e.getMessage(), e);
                    }
                } else {
                    try {
                        channel.sendResponse(Exceptions.toRuntimeException(SQLExceptions.unwrap(throwable)));
                    } catch (IOException e) {
                        LOGGER.error("Error sending failure: " + e.getMessage(), e);
                    }
                }
            });
        } catch (Throwable t) {
            try {
                channel.sendResponse(Exceptions.toRuntimeException(SQLExceptions.unwrap(t)));
            } catch (IOException e) {
                LOGGER.error("Error sending failure: " + e.getMessage(), e);
            }
        }
    }
}
